JP5098890B2 - Connection structure between wires and terminal fittings - Google Patents

Description

  The present invention relates to a connection structure between an electric wire and a terminal fitting.

Patent Document 1 includes an electric wire having an aluminum-based core wire and a terminal fitting having a wire barrel for crimping the core wire portion exposed at the end of the electric wire and having a cylindrical main body portion in front of the wire barrel. A connection structure is disclosed. The terminal fitting is integrally formed by bending a copper-based metal plate. The main body portion can receive the mating terminal fitting, and a contact piece that can elastically contact the mating terminal fitting is disposed therein.
JP 2003-217784 A

  By the way, if moisture adheres to the connecting portion between the core wire portion and the wire barrel, there is a possibility that electrolytic corrosion may occur due to a potential difference generated between the core wire portion and the wire barrel. For this reason, it can be considered that the connection portion between the core wire portion and the wire barrel is sealed with resin to ensure the waterproof property of the connection portion. However, in this case, the resin may flow into the contact piece side of the main body, and if the resin adheres to the contact piece, the connection reliability with the mating terminal fitting may be reduced.

  The present invention has been completed based on the above circumstances, and an object thereof is to ensure connection reliability.

As a means for achieving the above object, the invention according to claim 1 is the connection structure between the electric wire and the terminal fitting, wherein the electric wire includes a core wire and an insulating coating covering the periphery of the core wire, and the terminal thereof. Is arranged such that the core wire portion is exposed by removing the insulating coating, and the terminal metal fitting is disposed in a cylindrical main body portion that can receive the mating terminal metal fitting, and behind the main body portion. A wire barrel that is crimped to a portion, a contact piece that is elastically contactable with the mating terminal fitting is disposed in the main body portion, and is raised from both ends in the width direction of the substrate portion that supports the electric wire. And having a pair of side plate portions integrally connected to the main body portion and the wire barrel , wherein a connecting portion between the core wire portion and the wire barrel is sealed with a resin, between the contact piece, before The space surrounded by the substrate section and the pair of side plate portions are closed, characterized in was configured to partition section dam flow to the contact side of the resin in a fluid state is provided .

  The invention of claim 2 is characterized in that, in the invention of claim 1, the partition portion is formed integrally by bending a conductive metal plate constituting the terminal fitting.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a seal plug is fitted to the insulating coating, and the terminal fitting is located behind the wire barrel and the seal plug. The seal plug has a seal portion that is in close contact with the inner wall of the cavity of the connector housing, and the seal plug has a fluid flow in front of the seal portion. It is characterized in that a flange portion that blocks the flow of the resin in the state toward the seal portion is provided in an overhanging manner.

<Invention of Claim 1>
When the resin is sealed at the connection portion between the core wire portion and the wire barrel, the resin in the fluid state is restricted from flowing to the contact piece side by the partition portion, so that the resin is prevented from adhering to the contact piece, and the other side Connection reliability with the connecting portion is ensured.

<Invention of Claim 2>
Since the partition portion is integrally formed by bending the conductive metal plate constituting the terminal metal fitting, it is easy to form and does not increase the number of parts.

<Invention of Claim 3>
Since the seal plug is provided with a flange portion that blocks the flow of the resin in a fluid state toward the seal portion in front of the seal portion, the resin can be prevented from adhering to the seal portion. A predetermined sealing property is ensured.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. The terminal fitting 10 is integrally formed by bending a metal plate made of copper or a copper alloy containing a large amount of copper and connected to the terminal of the electric wire 90. The electric wire 90 includes a core wire 91 formed by twisting aluminum wires made of aluminum or an aluminum alloy containing a large amount of aluminum, and a resin insulating coating 92 covering the periphery thereof. The core wire portion 93 is exposed and disposed at the end of the electric wire 90 by peeling off and removing the insulating coating 92.

  The terminal fitting 10 extends in the front-rear direction to support the electric wire 90, the board part 11, the main body part 12 positioned at the front end of the board part 11 and bent into a rectangular tube shape, and the front-rear direction center of the board part 11. A wire barrel 13 which is positioned slightly rearward and crimped to the core wire portion 93, and an insulation barrel which is crimped to the sealing plug 60 which is positioned at the rear end portion of the substrate portion 11 and is fitted to the insulating coating 92 of the electric wire 90. 14 and a side plate portion 15 which is raised from both ends in the width direction of the substrate portion 11 and is integrally connected to the main body portion 12 and the wire barrel 13. The terminal fitting 10 is housed by being inserted into the cavity of the connector housing (not shown) together with the electric wire 90 and the seal plug 60 from behind.

  A cantilevered contact piece 16 that is folded back in a mountain shape from the front end to the rear is provided in the main body 12 so as to be able to bend. A male tab of a mating terminal fitting (not shown) is inserted into the main body portion 12 from the front, and the inserted male tab elastically contacts the contact piece 16 so that both terminal fittings are electrically connected to each other. It has become.

  The wire barrel 13 is provided with a pair of barrel pieces 17 having an open barrel shape, and the insulation barrel 14 is provided with a pair of crimp pieces 18 having an open barrel shape. The barrel piece 17 is wound around the core portion 93 from both sides in the width direction, and the crimping piece 18 is wound around the seal plug 60 from both sides in the width direction.

  In addition, after the electrical connection between the wire barrel 13 and the core wire portion 93 is established, an insulating resin, for example, a silicon-based resin (such as “Buscoke” from Cemedine) is applied. The waterproofness in this part is ensured.

  In addition, the terminal fitting 10 is provided with a partition portion 21 between the rear end of the main body portion 12 and the front end of the core wire portion 93 to block the flow of the resin in a fluid state toward the contact piece 16 side. . As shown in FIG. 2, the partition portion 21 has a shape in which a pair of projecting pieces 22 that integrally project from the rising end (upper end) of the side plate portion 15 are bent inward from each other and arranged in an opposing manner. ing. The folded back projecting pieces 22 are arranged so that their outer surfaces can come into contact with the inner surface of the side plate 15, their inner surfaces are arranged so as to be able to come into contact with the inner surface of the other side, and their projecting end faces are the substrate part 11. Therefore, the space surrounded by the side plate portion 15 and the substrate portion 11 is closed, thereby forming a weir that blocks the flow of the resin.

  The seal plug 60 is made of rubber such as silicon rubber and has a long and narrow cylindrical shape in the front-rear direction, and has an electric wire passage hole 61 through which the electric wire 90 passes in close contact. Specifically, the seal plug 60 includes a crimped portion 62 that is crimped by the insulation barrel 14, and a seal portion 63 that is coupled to the inner wall of the connector housing cavity and is closely coupled to the inner wall of the connector housing. Become.

  The seal portion 63 is provided with a plurality of lips 64 projecting outwardly at intervals in the front-rear direction, and these lips 64 are brought into close contact with the inner wall of the cavity in an elastic state so that the inside of the cavity is liquid-tight. It is designed to be sealed in a shape. The pressure-bonded portion 62 has a flat pressure-bonded surface 65 in the front-rear direction at a portion corresponding to the insulation barrel 14, and a flange that projects integrally from the pressure-bonded surface 65 to the outside at the front end portion over the entire circumference. A portion 66 is provided. The flange portion 66 is disposed in front of the insulation barrel 14, and as shown in FIG. 3, its substantially lower half is received by the arc-shaped substrate portion 11 and is in close contact with the inner surface of the substrate portion 11. . Therefore, the resin in the flow state is blocked by the flange portion 66 from flowing toward the seal portion 63 side.

Next, the effect of this embodiment is demonstrated.
First, the core portion 93 is exposed by cutting off the insulating coating 92 at the end of the electric wire 90, and the seal plug 60 is fitted to the insulating coating 92 immediately after the core portion 93. Subsequently, the electric wire 90 is placed on the substrate portion 11 of the terminal fitting 10, and in this state, both the barrel pieces 17 of the wire barrel 13 are caulked to the core wire portion 93, and both the crimping pieces 18 of the insulation barrel 14 are sealed with the sealing plug 60. It crimps to the to-be-bonded surface 65 of. As a result, the terminal fitting 10 is electrically and mechanically connected to the end of the electric wire 90.

  Subsequently, a resin in a fluid state is applied to a connection portion between the wire barrel 13 and the core wire portion 93, and the periphery of the core wire portion 93 is resin-coated. At this time, since the flow of the resin toward the contact piece 16 is blocked by the partition portion 21, adhesion of the resin to the contact piece 16 is avoided, and connection reliability with the mating terminal fitting is ensured. Moreover, since the partition portion 21 is integrally formed by bending the metal plate constituting the terminal fitting 10, it is easy to mold and does not increase the number of parts.

  Further, since the flow of the resin toward the seal portion 63 is blocked by the flange portion 66, a predetermined sealing property by the seal portion 63 is also ensured. Thus, the occurrence of a problem that is a concern with resin sealing is surely avoided.

  Thereafter, when the resin is cured, a thin insulating coating 30 is formed on the surfaces of the wire barrel 13 and the core portion 93, and waterproofing at this portion is ensured and the occurrence of electrolytic corrosion is also prevented. Further, after the resin is cured, the terminal fitting is inserted into the cavity of the connector housing, and is electrically connected to the mating terminal fitting along with the mating connector (not shown).

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The resin may be made of a vinyl-based material that can be dissolved at a high temperature.
(2) The partition portion may be a separate body from the terminal fitting.
(3) The contact piece may be a doubly supported beam.

It is a side view which shows the connection structure of the electric wire which concerns on Embodiment 1 of this invention, and a terminal metal fitting. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Terminal metal fitting 11 ... Board | substrate part 12 ... Main-body part 13 ... Wire barrel 16 ... Contact piece 21 ... Partition part 60 ... Seal plug 66 ... Flange part 90 ... Electric wire 92 ... Insulation film 93 ... Core wire part

Claims (3)

In the connection structure between the wire and the terminal fitting,
The electric wire includes a core wire and an insulating coating that covers the periphery of the core wire, and the core wire portion is exposed and disposed at the terminal by removing the insulating coating,
The terminal fitting includes a cylindrical main body portion that can receive the mating terminal fitting, and a wire barrel that is positioned rearward of the main body portion and is crimped to the core wire portion, and the counterpart in the main body portion. Contact pieces that can be elastically contacted with the side terminal metal fittings are disposed , and a pair of side plate portions that are raised from both ends in the width direction of the board portion that supports the electric wires and are integrally connected to the main body portion and the wire barrel are provided. And what
The connecting portion between the core wire portion and the wire barrel is sealed with resin,
A partition between the connection portion and the contact piece that closes a space surrounded by the substrate portion and the pair of side plate portions and blocks the flow of the resin in a fluid state to the contact piece side. A connection structure between an electric wire and a terminal fitting, characterized in that a portion is provided.   The connection structure between an electric wire and a terminal fitting according to claim 1, wherein the partition portion is formed integrally by bending a conductive metal plate constituting the terminal fitting. A sealing plug is fitted to the insulating coating, and the terminal fitting includes an insulation barrel that is positioned behind the wire barrel and is crimped to the sealing plug. It has a seal part that is in close contact with the inner wall of the cavity of the connector housing,
3. The electric wire according to claim 1, wherein the seal plug is provided with a protruding flange portion for blocking the flow of the resin in a fluid state toward the seal portion in front of the seal portion. Connection structure with terminal fittings.

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